| 峨眉山玄武岩组铜矿化与层位关系研究 |
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| 关键词:copper ore basalt Guizhou Yunnan |
| 基金项目:中国科学院知识创新工程重要方向项目(编号:KZCX3-SW-125);国家自然科学基金(编号:40072033);国家重点基础规划发展项目(编号:G1999043213) |
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| The Relationship between the Horizon of the Emeishan Basalt Formation and Copper Mineralization |
| According to the geochemical steep zonal patternof mineralization,the authors have found the clues in search for a new type ofcopper ore depositsin the border area between Yunnan and Guizhou provinces. The copper mineralization is constrained by the ancient volcanic vents of Permian basaltic eruption.Occurring in the strata of Emeishan basalt Formation,they are difficult to be reco-gnized.Copper ores are dominated by native copper and tenorite in certainspecific strata of ignimbrite and volcanic breccia tuffs. Copper mineralization isclosely related to siliceous bitumen rocks some 15 m in thickness and thus occurs in a reduction environment.A new type of copper ore deposits is very likely to be found.On the basis of field findings, mineral assemblages and modes of occurrence of ores,Copper mineralization has been divided into the following types:①Siliceous asphaltene copper mineralization;②Copper mineralization of secondary oxides and sulfides;③Massive disseminated native copper mineralization;④Hydrothermal zeolitized tenorite mineralization;⑤Tuffaceous breccia typechalcopyrite mineralization;⑥Carbon-siliceous chalcocite and native coppermineralization. Among these types of copper mineralization, the asphaltene copper mineralization is widely distributed in the border area between Yunnan and Guizhou provinces and generally occur in vesicles of ignimbrite and copper materials, which provide copper for mineralization. The copper mineralization is intimately related to reduction environments. Native copper and tenorite widely occur in siliceous bitumen rocks, controlled by specific ore-forming strata. The asphaltene type copper mineralization is of important significance in the innovative research and prospecting work. |
| ZHANG Zheng-wei,CHENG Zhan-dong,ZHU Bing-quan,ZHANG Qian,ZHU Xiao-qing,HU Yao-guo.2004.The Relationship between the Horizon of the Emeishan Basalt Formation and Copper Mineralization[J].Acta Geoscientica Sinica,25(5):503-508. |
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